4k Random Read/Write
Each level tested includes 300 data points (five minutes of one second reports) to illustrate performance variability. The line for each queue depth represents the average speed reported during the five-minute interval. 4K random speed measurements are an important metric when comparing drive performance, as the hardest type of file access for any storage solution to master is small-file random. 4K random performance is a heavily marketed figure, and is one of the most sought-after performance specifications.
The Enterprise Performance 15K v4 starts out with an impressive average of 543 IOPS at QD256, trailed slightly by the Savvio 15K.3 with 540 IOPS, and the Toshiba MK1401GRRB with 507 IOPS.
Our Latency vs IOPS charts compare the amount of performance attained from each solution at specific latency measurements. Many applications have specific latency requirements. These charts present relevant metrics in an easy to read manner for readers who are familiar with their application requirements. The HDDs that are lowest and furthest to the right exhibit the most desirable latency characteristics.
All three HDDs fall within a similar latency envelope, though the Savvio 15K.3 ekes out a slight win.
The Enterprise Performance 15K takes a big lead with an average of 506 IOPS at QD256. The Savvio 15K.3 drive averages 428 IOPS, and the Toshiba averages 444 IOPS.
The Enterprise Performance 15K v4 separates itself from the pack with a superb latency-vs-IOPS ratio.
Our write percentage testing illustrates the varying performance of each solution with mixed workloads. The 100% column to the right is a pure write workload of the 4k file size, and 0% represents a pure 4k read workload.
The 15K v4 separates itself from the pack as we mix in more write activity, and takes a considerable lead with pure random write activity.
We record power consumption measurements during our test run at QD256. It is important to consider watts-per-GB in the overall analysis due to the varying capacities in the test pool.
The Enterprise Performance 15K v4 requires 7.7 watts during the test.
We generate IOPS-to-watts measurements from data recorded during the test period. The 15K v4 averages 59 IOPS-per-watt during the write workload, and 69 IOPS-per-watt during read activity.
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- Page 1 [Introduction]
- Page 2 [Enterprise Performance 15K HDD v4 Internals and Specifications]
- Page 3 [Test System and Methodology]
- Page 4 [Benchmarks - 4k Random Read/Write]
- Page 5 [Benchmarks - 8k Random Read/Write]
- Page 6 [Benchmarks - 128k Sequential Read/Write]
- Page 7 [Benchmarks - Database/OLTP and File Server]
- Page 8 [Benchmarks - Email Server]
- Page 9 [Final Thoughts]
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